I found problem with scrubbing when remote and using a firestick 4k, if you try to scrub past the buffer, it will jump back and forth and eventually stop moving forward making it impossible to get to where you want to go. For example, trying to scrub 60 minutes into a sports game from the beginning is next to impossible. As long as you wait for the buffer short burst back or front work great. I don't remember it always being like that as I've slowly replaced all my clients with apple TVs which don't have the issue at all.
I love the software and don't want to sound like I'm complaining, I just thought I would bring it to the attention of the developers. The firestick travels a lot better than apple tv which is how I found the problem in the first place.
Cheers